塔里木盆地库车坳陷中生代原型盆地分析

发布时间：2019-04-04 14:25

【摘要】：运用地震资料、地表露头、钻井和测井资料以及非地震物探等资料,对塔里木盆地库车坳陷中生代的盆地结构、构造样式、区域构造演化进行区域构造解析,采用地层趋势厚度法计算中生界剥蚀厚度,结合沉积学资料对库车坳陷中生代原型盆地进行成因分析。库车坳陷残留中生界总体上为北厚南薄、北剥南超的地质结构,北部强烈角度不整合在南天山海西运动期褶皱带之上,南部微角度不整合在寒武系—奥陶系之上。库车坳陷中生代原型盆地属于上覆于南天山海西运动期造山带和塔里木克拉通边缘过渡带的拗陷盆地,地壳均衡可能是盆地沉降的主要动力。海西运动使南天山褶皱隆升,早二叠世在塔里木克拉通和南天山有强烈的火山作用,在盆山过渡带形成了库车坳陷盆地雏形。三叠纪地壳开始均衡下沉,造山带塌陷,在盆山过渡带发育拗陷盆地。侏罗纪、白垩纪坳陷继承性发育,但是盆地轴线、沉降和沉积中心发生轻微的迁移,白垩纪晚期发生区域抬升剥蚀。
[Abstract]:Based on seismic data, surface outcrop data, drilling and logging data and non-seismic geophysical data, the Mesozoic basin structure, structural style and regional tectonic evolution of Kuqa depression in Tarim Basin are analyzed. The Mesozoic prototype basin in Kuqa depression is analyzed by using trend thickness method to calculate Mesozoic denudation thickness combined with sedimentological data. The residual Mesozoic in Kuqa depression is generally a geological structure of thick north and thin south, north peeling south super, strong angle unconformity in the south Tianshan Hercynian fold belt, and micro angle unconformity in the Cambrian-Ordovician system in the south. The Mesozoic prototype basin of Kuqa depression belongs to the depression basin overlying the Hercynian orogenic belt of the southern Tianshan Mountains and the transitional zone of the Tarim craton margin. The crustal equilibrium may be the main driving force of the subsidence of the basin. The Hercynian movement caused the South Tianshan fold to rise and the early Permian had a strong volcanic action in the Tarim craton and the South Tianshan Mountains. The Kuqa depression basin was formed in the basin-mountain transitional zone. The Triassic crust began to sink evenly, the orogenic belt collapsed, and depression basins developed in the basin-mountain transitional zone. Jurassic, Cretaceous depression developed inheritance, but the basin axis, sedimentation and sedimentary center occurred slight migration, regional uplift and denudation occurred in the late Cretaceous.
【作者单位】：中国石油大学油气资源与探测国家重点实验室;中国石化中原油田分公司勘探开发研究院;中国石化中原油田分公司博士后科研工作站;中国石油塔里木油田分公司勘探开发研究院;
【基金】：国家科技重大专项(2011ZX05003-004)
【分类号】：P534.5

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